None of them really makes sense in a school situation. 1. to combine in abstaining from, or preventing dealings with, as a means of intimidation or coercion: to boycott a store .
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1. "In whatever situation, don't boycott your classmates."
2. "Boycott is not allowed at school."
3. "Boycotting behaviour is not allowed."
The trouble is, I really don't know what kind of action you are talking about here, Miyabi. Could you explain more?
Mister MicawberostracizedI like this one. I also like shunned, though it's out of fashion now.